A hypothesis (plural hypotheses) is a proposed explanation for a phenomenon. For a hypothesis to be a scientific hypothesis, the scientific method requires that one can test it.
A mountain range (mountain chain, mountain belt) is a geographic area with many mountains. A 'mountain system' or 'system of mountain ranges' includes geological features that are in the same region as a mountain range.Mountain ranges usually include highlands or mountain passes and valleys.Individual mountains in the same range do not always have the same geology or petrology.ountain ranges outside of these two systems include the Arctic Cordillera, the world's northernmost mountain system. If the definition of a mountain range includes underwater mountains, then the ocean ridges form the longest continuous mountain system on Earth, with a length of 65,000 kilometres (40,400 mi).
The mighty chunks rise all over the world, including the oceans. They usually have steep, sloping sides and sharp or rounded ridges, and a high point, called a peak or summit. Most geologists classify a mountain as a landform that rises at least 1,000 feet (300 meters) or more above its surrounding area. A mountain range is a series or chain of mountains that are close together.